Hi All,
The device i´m trying to support does not have a framebuffer hardware,
instead there is a api in user land with two simple functions:
1 - Allocate a memory buffer
2 - Render this buffer to screen.
My device also have a fixed resolution of 640x480 and its using ARGB8888.
But even with this simple api i´m clueless about how to write a driver for
it.
So far i could understand that for my case the best system is DEVMEM and my
"driver" needs basically 3 parts:
1 - A Directfb gxfdriver for this "device" implementing functions from
GraphicsDeviceFuncs and GraphicsDriverFuncs
2 - A "Screen" implementing ScreenFuncs,
3 - One or more "Layer" - implementing DisplayLayerFuncs
For 1:
- I´m not sure if a i have to implement the drawing functions like
FillRectangle or if there is a generic fallback because there is no hardware
acceleration.
- i don't know how to map the memory allocated by this function so it
cam be used by dfb, its returns a pointer to memory like malloc does...
- i couldin´t find which fields my DeviceData and DriverData should
have.
And i´m completely in the dark with the 2 and 3, i couldin´d understand
which one is responsible for call my "Render" function all i could figure is
that my fixed resolution should be returned by the GetScreenSize() func in
"Screen". I appreciate if anyone could point me which functions are
mandatory for a implementing a basic Layer and Screen.
Sorry for my bad English, and thanks in advance,
Welson Jr
Directfb Noob
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